I really hope at some point he stops writing and speed sketches the rest of the "book" so that it can be completed after his inevitable passing at the level of his vision.

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PS- not to be "that guy" but I do think that a future edition should port the MMIX to RISC-V because it'll be actually runnable and I'd bet money that RISC-V is the educational standard going forward for the next 50 years.